@article{VSGU_2014_10_a4,
     author = {V. M. Montlevich},
     title = {On the submodularity of the profit function in a problem of transport planning},
     journal = {Vestnik Samarskogo universiteta. Estestvennonau\v{c}na\^a seri\^a},
     pages = {48--54},
     publisher = {mathdoc},
     number = {10},
     year = {2014},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VSGU_2014_10_a4/}
}